package org.elasticsearch.index.analysis;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.apache.lucene.analysis.TokenFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;

import java.io.IOException;

public class STConvertTokenFilter extends TokenFilter {

    private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
    private String delimiter=",";
    private STConvertType convertType= STConvertType.SIMPLE_2_TRADITIONAL;
    private Boolean keepBoth=false;
    
    public STConvertTokenFilter(TokenStream in, STConvertType convertType,String delimiter,Boolean keepBoth) {
        super(in);
        this.delimiter = delimiter;
        this.convertType = convertType;
        this.keepBoth=keepBoth;
    }
    
    @Override
    public final boolean incrementToken() throws IOException {

        if (!input.incrementToken()) {
            return false;
        }

        StringBuilder stringBuilder = new StringBuilder();

        String str = termAtt.toString();
        termAtt.setEmpty();
        String converted= STConverter.getInstance().convert(str, convertType);
        if(!converted.isEmpty())
        {
            stringBuilder.append(converted);
            if(keepBoth){
                stringBuilder.append(delimiter);
                stringBuilder.append(str);
            }
        }else
        {
            stringBuilder.append(str);
        }

//        termAtt.setEmpty();
        termAtt.resizeBuffer(stringBuilder.length());
        termAtt.append(stringBuilder.toString());
        termAtt.setLength(stringBuilder.length());
        return true;
    }

    @Override
    public final void end() throws IOException {
        super.end();
    }

    @Override
    public void reset() throws IOException {
        super.reset();
    }

}
